In vegans, a deficiency of vitamin B₁₂ may be masked by a high intake of folate.

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Vegans may consume a high amount of folate-rich foods, which can mask a vitamin B₁₂ deficiency. This is because folate can correct the anemia caused by vitamin B₁₂ deficiency, but it does not address the underlying nerve damage that can result from B₁₂ deficiency. Therefore, it is important for vegans to ensure adequate B₁₂ intake through fortified foods or supplements, even if they are consuming sufficient amounts of folate.

In Vegans, a Deficiency of Vitamin B₁₂ May Be Masked